Stairway to Valhalla

Flash
When Stairway to Valhalla enters the battlefield,
roll a 6-sided die. Reveal that many cards from
the top of your library. Put all land cards revealed
this way onto the battlefield tapped and put the
rest into your graveyard.
{2}{g}, Sacrifice Stairway to Valhalla: Scry equal to
the number of creature cards in target players graveyard.